Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c26a8b97f542e1…

MALICIOUS

PDF

90.0 KB Created: 2021-07-21 06:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a99aebd9ab7aa964ad2646304a1fbefe SHA-1: 68f24747caa407ea7a9792f40407975b3cc9039c SHA-256: 20c26a8b97f542e1f0416867795f21949542ac33a5eb6401c45a354c92e848f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing lure. The heuristics indicate it contains a link farm pointing to compromised WordPress upload storage, likely intended to host malicious content. The document's purpose is to trick users into providing credentials by mimicking MFA or one-time code prompts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2b7c1cd6c---wesagebibop.pdf
    • http://arohitourandtravels.com/userfiles/file/35733667571.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a4492774f80---99553007799.pdf
    • http://mistralizmiryonetim.com/uploads/file/makozi.pdf
    • https://cabsfromheathrow.com/userfiles/file/narilejarutajizorufibib.pdf
    • http://palyavalaszto.hu/teszt/upload/file/fimuxuvasifat.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a646a21688b---1473744132.pdf
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/48723885825.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/sfominitg507ikbku5qq24qo2v/goredejulivabebaruwuvaxo.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i1qkoo1td7e0gesr970ps73433/zitun.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/01337727d38c79ddfcb33e235094dccf/kajefamigubuzexigazafosid.pdf
    • http://fritz-fahrlaender.ch/download/69888385844.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e51caba03---77902555259.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b0c390c05---76837484401.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/i31ktrkplu5m9ivkuo4llf2auh/48562525110.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a9677dd5---98238983544.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6a0d57b1---6018985667.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/gd0hstbthvhluo9dthnlna6eft/33313936467.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effc6230326---34172963831.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/852jfb9jakf45d1vuvtrpc00t2/kogilabubatuvas.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f62d5b1d9---76396506813.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e760b0f13---jozawubetonejeduzuzovufop.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4bea66ea3---4647822450.pdf
    • http://yachtandgulet.com/userfiles/file/jumujezugosu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stomach+pain+in+epigastric+region
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff46.bin
54faa4db8a7bd8bdf6216c171d0a7407f0d6abc179182e0b1e265a715eecf985
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF46 16528 bytes
font_01_sfnt_off00012995.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 16792 bytes
font_02_sfnt_off000141ac.bin
5ab2cf7c4b7258a0660fb3892ab072e3fc2ba92ff68a5b82f710e59dc2fa35cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x141AC 10852 bytes